Sprocket-wheel for tentering-machines



(No Model.) D. BABGOCK.

SPRUGKET WHEEL EUR TENTERING MACHINES.

UNITED STATES PATENT Orr-Ica.

DARIUS BABCOCK, OF MERIDEN, CONNECTICUT.

SPROCKET-WHEEL FOR TENTERlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 471,529, dated Mar-ch29, 1892. Application filed July 24, 1891. Serial No. 400,657. (Nomodel.)

To a/ZZ whom it may concern:

Be it known that I, DARIUS BABCOCK, a citizen of the United States,residing at Meriden, in the county of New Haven and State ofConnecticut, have invented certain new and useful Improvements inSprocket-Wheels for Tentering-Machines; and I do declare the followingto be a full, clear, and exact description of the invention, such aswill en` ro able others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the letters and figures of reference marked thereon, which form apart of this specification.

My invention relates to improvements in sprocket or chain carrying anddriving wheels. It is more particularly designed for use intentering-machines, but is applicable to other 2o purposes. Itisspeciallyadapted to machines for painting and sizing cloth forWindowshades. Heretofore machines of this description have been providedwith s olid wheels, which in-practice have been found to give 2 5unsatisfactory results.

The object of the present invention is to obviate Wholly or in part thedefects existing in machines of this character by providing them with awheel fitted with radial adj ustable arms, the details of which will bemore fully hereinafter set forth.

In the drawings, Figure 1 representsa side elevation of a wheel providedwith adjustable arms, and is well calculated to convey an idea of myinvention. A section of the wheel is broken away in Fig. 1 to facilitateillustration. Fig. 2 is a view in section of Fig. l, taken through theline X. Fig. 3 is also a sect-ion of Fig. 1, taken through line Z.

4o Y Similar letters and figures refer to similar parts'throughout theseveral Views.

The wheel or pulley A constitutes the body of the device and is providedwith radial grooves or channels ct for the reception of the 4 5adjustable sprocket-arms B. Elon gated holes or slots are formed in theshanks ofl vthe sprocket-arms, as shown at b. The sprocketarms are heldin position by the bolts or screws C, which engage with the threadedholes in the arms of the wheelAin a manner thought 5o to be too wellunderstood to require further explanation.

Head-pieces D are formed near the outer ends of the sprocket-arms andbeyond the rim of the wheel A for the purpose of form- 55 ing a supportfor the side bars 2 of the chain F, thereby relieving a portion of thestrain which would come otherwise entirely upon vthe cross-bars orpivots o of the chain F.

These head-pieces D are beveled, as at g g, 6o from their transversecenters to each end, whereby the adjacent beveled surfaces of twoadjoining head-pieces are in the same plane and form fiat rests for theengaging side bars of the chain, as clearly shown in Fig. 1 of 65 thedrawings. The angles of the head-pieces are determined by the number ofsprocketarms employed. The extreme outer ends of the arms are formedinto transversely-slotted forks e for the reception of the cross-bars 7oof thechain as the wheel revolves. An adjusting-screw isintroduced intothe inner end of the sprocket-arm, as shown at P, for the purpose ofadjusting the same by forcing the arm outwardly, when required. Thechain F forms no part of the present invention,but is shown toillustrate the manner in which it engages the sprocket-arms.

In machines of the character referred to in the foregoing a steady anduniform motion is absolutely necessary for the production of perfectgoods, and where solid wheels are employed the wear of the same at thepoints of contact and the stretch of the chain occasions a slipping ofthe points of contact, V

which produces an unsteady jerking motion, which frequently tears andotherwise injures the fabric; but with my improved wheel all wear andstretch maybe readily compensated by forcing the sprocket-arms outwarduntil. they register perfectly with the cross-bars of the chain. Thismay be accomplished by turning the adj Listing-screw in the properdirection, since the head of the screw rests against the hub of thewheel, as shown at 3. 95 Having thus described my invention, what Iclaim, and desire to secure by Letters Patent, is

A sprocket-wheel provided with a series of l In testimony whereof Iaffix my signature in radiallyfdisposed and adjustable arms,

said presence or two witnesses.

arms carrying at their free ends a head beveled from its transversecenter to each end, DARIUS BABCOCK Witnesses:

FRANK S. FAY, JOHN TREDENNICK.

l 5 for the purpose specified, and transverselyslotted forks projectingcentrally from said heads, substantially as set fort

